This circuit was found in a Texas Instruments documentation from the 1980s. The circuit monitors engine temperature by warning of engine warm-up and warning when the fan is on.
We found this 4 W amplifier in an old Argentine publication of the 70's. The circuit can be made...
An article in Radio Electronics magazine from November 1962 taught how to connect two common...
This Pierce oscillator was found in American documentation from the 1980s. Transistors support modern...